4-(3-Butenyl)-4''-ethyl-2'-fluor-1,1':4',1''-terphenyl

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2021-02-09 - 2021-02-12

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)

Version / remarks:

1981

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

GLP compliance:

no

Type of method:

sieving

Type of particle tested:

agglomerate

Type of distribution:

volumetric distribution

Key result

Percentile:

D10

Mean:

ca. 150 µm

Remarks on result:

other: St. dev. not determined

Key result

Percentile:

D50

Mean:

ca. 500 µm

Remarks on result:

other: st. dev. not determined.

Key result

Percentile:

D90

Mean:

> 4 000 µm

Remarks on result:

other: st. dev. not determined.

Individual results (laser diffraction)

The test item consisted of irregularly formed crystalline particles. The test item was sieved with a mesh size of 1000 μm. 68.5 % (w/w) of the test item passed the sieve and only this fraction was measured with laser diffraction. Due to the relatively low number of particles which passed a 1000 μm sieve the particle size distribution via laser diffraction was evaluated to be insufficient and the results are not shown in this report. Therefore, a sieving measurement was performed additionally to determine the particle size distribution.

Individual results (sieving)

Due to the limited amount of substance available it was not possible to use a fresh sample for this additional experiment. The sample used for the sieving war already sieved over a 1000 μm sieve as preparation for the laser diffraction. After a sample was taken for the laser diffraction (laser diffraction as liquid dispersion only needs a small amount, e.g. one spatula of sample) both fractions were combined once again and this sample was used for the sieving analysis. 43.38 g of the test item were placed on the top sieve. After closing the sieve stack and placing it into the sieving machine sieving was performed for 10 min with amplitude of 1.1 mm.

 

The particle size D50 estimated from this measurement was:

D50 = 500 μm

 

The particle size D10 estimated from this measurement was:

D10 = 150 μm

 

The particle size D90 estimated from this measurement was:

D90 > 4000 μm

 

As the sieving analysis showed a comparable fraction below 1000 μm (approximately 70 %) than the sieving before the laser diffraction the result from the sieving analysis was evaluated to be reliable and therefore, this result was used as final result.

 

Conclusions:

The median particle size L50 of the test item deduced from the particle size distributions was 500 μm.

Executive summary:

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L50 of the test item deduced from the particle size distributions was 500 μm.

Description of key information

The median particle size L50 of the test item deduced from the particle size distributions was 500 µm.

Additional information

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110. The median particle size L50 of the test item deduced from the particle size distributions was 500 μm.